Gree U-Match GUD160W/A-X - Page 24

DC Inverter U-Match Series Cassette Type Unit
20
3.2.3 Connection Pipe Requirement
3.2.3.1 Installation Notice and Requirement on Connection Pipe
Installation method: Connect the connection pipes first to the indoor unit and
then to the outdoor unit. When bending a connection pipe, be careful not to damage
the pipe. Do not over-tighten the screw nut, otherwise leakage will occur. Besides,
the outside of connection pipe should be added with a layer of insulating cotton to
protect it from mechanical damage during installation, maintenance and
transportation.
Item
Model
Size of Fitting
Pipe(Inch)
Maximum
pipe
length(m)
Biggest drop
between
indoor and
outdoor
units (m)
Drainage
pipe(Outer
Diameter × wall
thickness) (mm)
Liquid Gas
GUD35T/A-S
1/4
3/8
30
15
Φ25×1.5
GUD50T/A-S
1/4
1/2
35
20
Φ25×1.5
GUD71T/A1-S
3/8
5/8
50
25
Φ25×1.5
GUD71T/A-S
3/8
5/8
50
25
Φ25×1.5
GUD100T/A-S
3/8
5/8
50
25
Φ25×1.5
GUD125T/A-S
3/8
5/8
65
30
Φ25×1.5
GUD140T/A-S
3/8
5/8
75
30
Φ25×1.5
GUD160T/A-S
3/8
5/8
75
30
Φ25×1.5
Connection pipe should adopt water-proof insulating material. Its wall thickness
should be 0.5-1.0mm and the pipe wall should be able to withstand 6.0MPa. The
longer the connection pipe is the worse cooling and heating performance it has.
When the drop between indoor and outdoor units is larger than 10m, an oil
return bend should be added every 6 meters.